Lamp for use in photographic dark rooms



(No Model.)

F. HAES.

LAMP FOR USE IN PHOTOGRAPHIG DARK ROOMS.

Patented Apr. 8, 1890f UNITED STATES PATENT FEicE.

FRANK HAES, OF NORTH KENSINGTON, COUNTY OF MIDDLESEX, ENGLAND.

LAMP FOR USE 1N PHOTOGRAPHIC DARK-ROOMS.

SPECIFICATION forming part of Letters Patent No. 425,319, dated April 8, 1890.

Application filed June 4;, 1889- To aZZ whom it may concern:

Be itknown that I, FRANK HAEs, gentleman,

a subject of the Queen of Great Britain, residing at 28 Bassett Road, North Kensington, in 5 the county of Middlesex, England, have invented certain new and usefullmprovements i-n Lamps for Use in Photographic Dark- Rooms and for other Uses, of which the following is a specification.

The object of my invention is to obtain a more suitable and convenient form of lamp than that hitherto employed in photographic dark-rooms, and which is also applicable to other uses wherein a non-actinic and screened light is desirable, and such, for example, as

dissolvingwiew entertainments, where the operator requires a light of this description in order to select the slides, or lectures where a lecturer requires a readingdamp. For this purpose I employ a candle-lamp of that class in which a reflecting-hood is employed, and known as a reflecting reading-lamp, and preferably telescopic-that is to say, constructed in such a manner that the candle- 2 5 tube carrying the hood is capable of sliding up and down in a fixed tube carried by the base of the lamp. I cover the front of the hood with ruby or other non-actinic glass, which is mounted in a frame or cap fitting tightly upon the rim of the hood, and there removably secured by means of bayonet-fast enings or catches, or otherwise. The rim of this cap or frame is formed with double walls, leaving an annular space all round between them closed at the front but open at the rear, and the inner wall is provided with a ring of perforations in order to admit a supply of air to the lamp to support combustion. One of the walls of the cap is, at the rear of the perforations, formed with a shoulder in order to obstruct any rays of light that might pass out through the perforations.

In order to carry off the products of com bustion and at the same time efficiently obstruct the passage of light, the chimney is constructed with an enlargement or chamber somewhat of the form of two cones meeting at their bases, and within this chamber is arranged an inverted cone notched or scalloped around the edge to afford egress for the products of combustion, and provided with down Serial No. 313 ,049- (No model.)

wardly-projecting legs to enable it to be supported in position.

In order that the said invention may be more clearly understood and readily carried into effect, I will proceed, aided by the accompanying drawings, more fully to describe the same, in which Figure 1 is a front elevation of a lamp constructed according to my invention. Fig. 2 is a vertical section taken at right angles to Fig. 1. Fig. 3 is a similar view to an enlarged scale of a portion of the cap, and Fig. & is a rear elevation of part thereof. Fig. 5 is a Vertical section of the candle-cone or burner and connected parts separately. Fig. dis a plan of the cone-chamber or chimney with the upper part removed, and Fig. 7 is a side elevation of the cone separately.

Like parts are indicated by similar letters of reference in the several figures.

a represents the base or foot of the lamp, and a the fixed tube rising therefrom, into which is fitted, with capability of vertical movement, the candle-tube a containing the usual spring a Upon the upper part of the candle-tube a is removably fitted the candlecone b, which is secured in position in the usual manner by means of a bayonet-slot b in the candle-cone b engaging a pin or stud of upon the candle-tube a and the candlecone 1) is formed with an annular screen b rising vertically from the lower part thereof, and leaving a descending air-space b around the same, for the purpose hereinafter described.

its peculiar configuration, forms an annular ascending air-chamber 0* around the candlecone b, and it is furnished above the ring 0 with a ring of perforations 0 in order to admit a supply of air through the chamber 0* to the flame of the candle, and thus assist to keep the candle-cone b and candle cool at that point and promote combustion. Any rays of light that might pass out through the perforations c are arrested by the annular screen 19 of the candle-cone b, which is placed at such a distance from the candle-cone b as will afford an eificient passage for the necessary supply of air to the air-chamber 0*.

The front of the parabolic reflecting-hood c is covered or inclosed by means of a removable frame or cap (I, in which a disk of ruby or other non-actinic glass (1* is securely held by means of a projection d and a screw (Z The cap or frame d fits tightly upon the front or rim 0 of the hood 0, and is there removably secured by means of bayonet catches or fastenings, or otherwise.

The rim of the cap or frame (Z is formed.

with double walls (Z d, leaving an annular space (1 between them closed at the front,

but open at the rear, and the inner wall (1 is provided with a ring of perforations (Z formed in an annular rib or flange d, in order to admit the necessary supply of air to the lamp to support combustion, and the rib orfiange d also serves the purpose of a seat or stop for the glass d*, and obstructs the passage of light around the edge thereof to the front of the lamp, and the shoulder or angle (1 formed by the inner Wall (1 of the cap (I, effectually prevents the passage of any rays of light that might pass out through the peri forations d and between the walls (Z cl toward the rear of the lamp.

In order to carry off the products of combustion and at the same time efficiently obi struct the passage of light, the chimney is constructed with a removable enlargement or chamber 6 at the top thereof, such chamber being somewhat of the form of two cones meeting at their bases, where the two parts are easily separable, in order to enable the chamber e to be cleansed,and within this chamber 0 is loosely placed an inverted cone or de-' Hector e, formed with notches or scallops e around the edge thereof to afford egress to the products of combustion, and this cone is supported in position by means of downwardly-projecting legs 6 which take a bearing upon the lower part of the chamber 6. By these means I obtain a convenient form of dark-room or similar lamp, which may readily be adjusted to any position, and which, in consequence of the substitution of a candle for oil as the light-giving medium, is more.

cleanly, is not liable to have its contents spilled, and generally is better adapted for such uses.

When a white light is required in the darkroom or elsewhere, the cap d may be taken off or the hood 0 may be removed bodily, leaving the naked flame of the candle.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. A lamp constructed with a burner-cone having an annular screen rising vertically from the lower part thereof, so as to leave a descending air-space, and a hood having a down wardly-proj ecting tubular portion forming an ascending air-space, having a ring by which it embraces the burner-cone, and perforations between the air-spaces, substantially as herein shown and described.

2. A lamp constructed with a hood having a cap formed with a screened way or ways to conduct a supply of air to the interior of the lamp, substantially as herein shown and described.

3. A lamp constructed with a hood 0, a removable cap cl, adapted to receive a disk of non-aetinic glass (i and formed witha way or ways to conduct a supply of air to the interior of the lamp and screened against the emission of light, and a chimney or egress for the products of combustion screened against the emission of light, substantially as herein shown and described, and for the purpose stated.

4. A lamp constructed with a hood '0, a removable cap d, adapted to receive a disk of non-actinic glass d and provided with a rim formed of double walls (1 d", the inner one (2 of which terminates in a perforated rib or flange cl, forming a screened way or way-s to conduct a supply of air to the interior of the lamp, and a chimney consisting of a chamber 6, formed of two cone-shaped sections meeting at their bases and supportin g an inverted cone or deflector e,formed with notches 6 around its edge an d forming a screened outlet for the products of combustion, substantially as here in shown and described, and for the purpose stated.

5. A lamp constructed with a hood fitted or adapted to receive a disk of non-actinic glass, and provided with air-inlets at the rear of such glass screened against the emission of light, and a tubular fitting at the lower partof the hood and surrounding thecone or tube, and an outlet or chimney for the products of combustion screened against the emission of light, substantially as herein shown and described, and for the purpose stated.

. 6. A lamp constructed with a hood fitted or adapted to receive a disk of non-actinic glass, and provided with screened air-inlets at the rear of such glass, a tubular fitting c at the lower part of the hood formed with a ring 0 fitting the cone 1), and a ring of perforations 0 a protecting-screen b carried by the cone 1) and extending around and above said perforations, and a screened outlet or chimney for the products of combustion, substantially as herein shown and described.

FRANK HAES.

Witnesses:

O. M. WHITE, F. O. VENN.

IOO

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